/*!
 * reveal.js
 * http://lab.hakim.se/reveal-js
 * MIT licensed
 *
 * Copyright (C) 2013 Hakim El Hattab, http://hakim.se
 */

$(document).ready(function() {



var Reveal = (function(){

    'use strict';

    var SLIDES_SELECTOR = '.reveal .slides section',
        HORIZONTAL_SLIDES_SELECTOR = '.reveal .slides>section',
        VERTICAL_SLIDES_SELECTOR = '.reveal .slides>section.present>section',
        HOME_SLIDE_SELECTOR = '.reveal .slides>section:first-child',

    // Configurations defaults, can be overridden at initialization time
        config = {

            // The "normal" size of the presentation, aspect ratio will be preserved
            // when the presentation is scaled to fit different resolutions
            width: 960,
            height: 700,

            // Factor of the display size that should remain empty around the content
            margin: 0.1,

            // Bounds for smallest/largest possible scale to apply to content
            minScale: 0.2,
            maxScale: 1.0,

            // Display controls in the bottom right corner
            controls: true,

            // Display a presentation progress bar
            progress: true,

            // Push each slide change to the browser history
            history: false,

            // Enable keyboard shortcuts for navigation
            keyboard: true,

            // Enable the slide overview mode
            overview: true,

            // Vertical centering of slides
            center: true,

            // Enables touch navigation on devices with touch input
            touch: true,

            // Loop the presentation
            loop: false,

            // Change the presentation direction to be RTL
            rtl: false,

            // Number of milliseconds between automatically proceeding to the
            // next slide, disabled when set to 0, this value can be overwritten
            // by using a data-autoslide attribute on your slides
            autoSlide: 0,

            // Enable slide navigation via mouse wheel
            mouseWheel: false,

            // Apply a 3D roll to links on hover
            rollingLinks: true,

            // Theme (see /css/theme)
            theme: null,

            // Transition style
            transition: 'default', // default/cube/page/concave/zoom/linear/fade/none

            // Script dependencies to load
            dependencies: []
        },

    // Stores if the next slide should be shown automatically
    // after n milliseconds
        autoSlide = config.autoSlide,

    // The horizontal and verical index of the currently active slide
        indexh = 0,
        indexv = 0,

    // The previous and current slide HTML elements
        previousSlide,
        currentSlide,

    // Slides may hold a data-state attribute which we pick up and apply
    // as a class to the body. This list contains the combined state of
    // all current slides.
        state = [],

    // The current scale of the presentation (see width/height config)
        scale = 1,

    // Cached references to DOM elements
        dom = {},

    // Detect support for CSS 3D transforms
        supports3DTransforms =  'WebkitPerspective' in document.body.style ||
            'MozPerspective' in document.body.style ||
            'msPerspective' in document.body.style ||
            'OPerspective' in document.body.style ||
            'perspective' in document.body.style,

    // Detect support for CSS 2D transforms
        supports2DTransforms =  'WebkitTransform' in document.body.style ||
            'MozTransform' in document.body.style ||
            'msTransform' in document.body.style ||
            'OTransform' in document.body.style ||
            'transform' in document.body.style,

    // Throttles mouse wheel navigation
        mouseWheelTimeout = 0,

    // An interval used to automatically move on to the next slide
        autoSlideTimeout = 0,

    // Delays updates to the URL due to a Chrome thumbnailer bug
        writeURLTimeout = 0,

    // A delay used to activate the overview mode
        activateOverviewTimeout = 0,

    // A delay used to deactivate the overview mode
        deactivateOverviewTimeout = 0,

    // Holds information about the currently ongoing touch input
        touch = {
            startX: 0,
            startY: 0,
            startSpan: 0,
            startCount: 0,
            handled: false,
            threshold: 80
        };

    /**
     * Starts up the presentation if the client is capable.
     */
    function initialize( options ) {

        if( !supports2DTransforms && !supports3DTransforms ) {
            document.body.setAttribute( 'class', 'no-transforms' );

            // If the browser doesn't support core features we won't be
            // using JavaScript to control the presentation
            return;
        }

        // Force a layout when the whole page, incl fonts, has loaded
        window.addEventListener( 'load', layout, false );

        // Copy options over to our config object
        extend( config, options );

        // Hide the address bar in mobile browsers
        hideAddressBar();

        // Loads the dependencies and continues to #start() once done
        load();

    }

    /**
     * Finds and stores references to DOM elements which are
     * required by the presentation. If a required element is
     * not found, it is created.
     */
    function setupDOM() {

        // Cache references to key DOM elements
        dom.theme = document.querySelector( '#theme' );
        dom.wrapper = document.querySelector( '.reveal' );
        dom.slides = document.querySelector( '.reveal .slides' );

        // Progress bar
        if( !dom.wrapper.querySelector( '.progress' ) && config.progress ) {
            var progressElement = document.createElement( 'div' );
            progressElement.classList.add( 'progress' );
            progressElement.innerHTML = '<span></span>';
            dom.wrapper.appendChild( progressElement );
        }

        // Arrow controls
        if( !dom.wrapper.querySelector( '.controls' ) && config.controls ) {
            var controlsElement = document.createElement( 'aside' );
            controlsElement.classList.add( 'controls' );
            controlsElement.innerHTML = '<div class="navigate-left"></div>' +
                '<div class="navigate-right"></div>' +
                '<div class="navigate-up"></div>' +
                '<div class="navigate-down"></div>';
            dom.wrapper.appendChild( controlsElement );
        }

        // Presentation background element
        if( !dom.wrapper.querySelector( '.state-background' ) ) {
            var backgroundElement = document.createElement( 'div' );
            backgroundElement.classList.add( 'state-background' );
            dom.wrapper.appendChild( backgroundElement );
        }

        // Overlay graphic which is displayed during the paused mode
        if( !dom.wrapper.querySelector( '.pause-overlay' ) ) {
            var pausedElement = document.createElement( 'div' );
            pausedElement.classList.add( 'pause-overlay' );
            dom.wrapper.appendChild( pausedElement );
        }

        // Cache references to elements
        dom.progress = document.querySelector( '.reveal .progress' );
        dom.progressbar = document.querySelector( '.reveal .progress span' );

        if ( config.controls ) {
            dom.controls = document.querySelector( '.reveal .controls' );

            // There can be multiple instances of controls throughout the page
            dom.controlsLeft = toArray( document.querySelectorAll( '.navigate-left' ) );
            dom.controlsRight = toArray( document.querySelectorAll( '.navigate-right' ) );
            dom.controlsUp = toArray( document.querySelectorAll( '.navigate-up' ) );
            dom.controlsDown = toArray( document.querySelectorAll( '.navigate-down' ) );
            dom.controlsPrev = toArray( document.querySelectorAll( '.navigate-prev' ) );
            dom.controlsNext = toArray( document.querySelectorAll( '.navigate-next' ) );
        }

    }

    /**
     * Hides the address bar if we're on a mobile device.
     */
    function hideAddressBar() {

        if( /iphone|ipod|android/gi.test( navigator.userAgent ) && !/crios/gi.test( navigator.userAgent ) ) {
            // Events that should trigger the address bar to hide
            window.addEventListener( 'load', removeAddressBar, false );
            window.addEventListener( 'orientationchange', removeAddressBar, false );
        }

    }

    /**
     * Loads the dependencies of reveal.js. Dependencies are
     * defined via the configuration option 'dependencies'
     * and will be loaded prior to starting/binding reveal.js.
     * Some dependencies may have an 'async' flag, if so they
     * will load after reveal.js has been started up.
     */
    function load() {

        var scripts = [],
            scriptsAsync = [];

        for( var i = 0, len = config.dependencies.length; i < len; i++ ) {
            var s = config.dependencies[i];

            // Load if there's no condition or the condition is truthy
            if( !s.condition || s.condition() ) {
                if( s.async ) {
                    scriptsAsync.push( s.src );
                }
                else {
                    scripts.push( s.src );
                }

                // Extension may contain callback functions
                if( typeof s.callback === 'function' ) {
                    head.ready( s.src.match( /([\w\d_\-]*)\.?js$|[^\\\/]*$/i )[0], s.callback );
                }
            }
        }

        // Called once synchronous scritps finish loading
        function proceed() {
            if( scriptsAsync.length ) {
                // Load asynchronous scripts
                head.js.apply( null, scriptsAsync );
            }

            start();
        }

        if( scripts.length ) {
            head.ready( proceed );

            // Load synchronous scripts
            head.js.apply( null, scripts );
        }
        else {
            proceed();
        }

    }

    /**
     * Starts up reveal.js by binding input events and navigating
     * to the current URL deeplink if there is one.
     */
    function start() {

        // Make sure we've got all the DOM elements we need
        setupDOM();

        // Subscribe to input
        addEventListeners();

        // Updates the presentation to match the current configuration values
        configure();

        // Force an initial layout, will thereafter be invoked as the window
        // is resized
        layout();

        // Read the initial hash
        readURL();

        // Start auto-sliding if it's enabled
        cueAutoSlide();

        // Notify listeners that the presentation is ready but use a 1ms
        // timeout to ensure it's not fired synchronously after #initialize()
        setTimeout( function() {
            dispatchEvent( 'ready', {
                'indexh': indexh,
                'indexv': indexv,
                'currentSlide': currentSlide
            } );
        }, 1 );

    }

    /**
     * Applies the configuration settings from the config object.
     */
    function configure() {

        if( supports3DTransforms === false ) {
            config.transition = 'linear';
        }

        if( config.controls && dom.controls ) {
            dom.controls.style.display = 'block';
        }

        if( config.progress && dom.progress ) {
            dom.progress.style.display = 'block';
        }

        if( config.transition !== 'default' ) {
            dom.wrapper.classList.add( config.transition );
        }

        if( config.rtl ) {
            dom.wrapper.classList.add( 'rtl' );
        }

        if( config.center ) {
            dom.wrapper.classList.add( 'center' );
        }

        if( config.mouseWheel ) {
            document.addEventListener( 'DOMMouseScroll', onDocumentMouseScroll, false ); // FF
            document.addEventListener( 'mousewheel', onDocumentMouseScroll, false );
        }

        // 3D links
        if( config.rollingLinks ) {
            linkify();
        }

        // Load the theme in the config, if it's not already loaded
        if( config.theme && dom.theme ) {
            var themeURL = dom.theme.getAttribute( 'href' );
            var themeFinder = /[^\/]*?(?=\.css)/;
            var themeName = themeURL.match(themeFinder)[0];

            if(  config.theme !== themeName ) {
                themeURL = themeURL.replace(themeFinder, config.theme);
                dom.theme.setAttribute( 'href', themeURL );
            }
        }

    }

    /**
     * Binds all event listeners.
     */
    function addEventListeners() {

        window.addEventListener( 'hashchange', onWindowHashChange, false );
        window.addEventListener( 'resize', onWindowResize, false );

        if( config.touch ) {
            document.addEventListener( 'touchstart', onDocumentTouchStart, false );
            document.addEventListener( 'touchmove', onDocumentTouchMove, false );
            document.addEventListener( 'touchend', onDocumentTouchEnd, false );
        }

        if( config.keyboard ) {
            document.addEventListener( 'keydown', onDocumentKeyDown, false );
        }

        if ( config.progress && dom.progress ) {
            dom.progress.addEventListener( 'click', onProgressClicked, false );
        }

        if ( config.controls && dom.controls ) {
            var actionEvent = 'ontouchstart' in window ? 'touchstart' : 'click';
            dom.controlsLeft.forEach( function( el ) { el.addEventListener( actionEvent, onNavigateLeftClicked, false ); } );
            dom.controlsRight.forEach( function( el ) { el.addEventListener( actionEvent, onNavigateRightClicked, false ); } );
            dom.controlsUp.forEach( function( el ) { el.addEventListener( actionEvent, onNavigateUpClicked, false ); } );
            dom.controlsDown.forEach( function( el ) { el.addEventListener( actionEvent, onNavigateDownClicked, false ); } );
            dom.controlsPrev.forEach( function( el ) { el.addEventListener( actionEvent, onNavigatePrevClicked, false ); } );
            dom.controlsNext.forEach( function( el ) { el.addEventListener( actionEvent, onNavigateNextClicked, false ); } );
        }

    }

    /**
     * Unbinds all event listeners.
     */
    function removeEventListeners() {

        document.removeEventListener( 'keydown', onDocumentKeyDown, false );
        window.removeEventListener( 'hashchange', onWindowHashChange, false );
        window.removeEventListener( 'resize', onWindowResize, false );

        if( config.touch ) {
            document.removeEventListener( 'touchstart', onDocumentTouchStart, false );
            document.removeEventListener( 'touchmove', onDocumentTouchMove, false );
            document.removeEventListener( 'touchend', onDocumentTouchEnd, false );
        }

        if ( config.progress && dom.progress ) {
            dom.progress.removeEventListener( 'click', onProgressClicked, false );
        }

        if ( config.controls && dom.controls ) {
            var actionEvent = 'ontouchstart' in window && window.ontouchstart != null ? 'touchstart' : 'click';
            dom.controlsLeft.forEach( function( el ) { el.removeEventListener( actionEvent, onNavigateLeftClicked, false ); } );
            dom.controlsRight.forEach( function( el ) { el.removeEventListener( actionEvent, onNavigateRightClicked, false ); } );
            dom.controlsUp.forEach( function( el ) { el.removeEventListener( actionEvent, onNavigateUpClicked, false ); } );
            dom.controlsDown.forEach( function( el ) { el.removeEventListener( actionEvent, onNavigateDownClicked, false ); } );
            dom.controlsPrev.forEach( function( el ) { el.removeEventListener( actionEvent, onNavigatePrevClicked, false ); } );
            dom.controlsNext.forEach( function( el ) { el.removeEventListener( actionEvent, onNavigateNextClicked, false ); } );
        }

    }

    /**
     * Extend object a with the properties of object b.
     * If there's a conflict, object b takes precedence.
     */
    function extend( a, b ) {

        for( var i in b ) {
            a[ i ] = b[ i ];
        }

    }

    /**
     * Converts the target object to an array.
     */
    function toArray( o ) {

        return Array.prototype.slice.call( o );

    }

    /**
     * Measures the distance in pixels between point a
     * and point b.
     *
     * @param {Object} a point with x/y properties
     * @param {Object} b point with x/y properties
     */
    function distanceBetween( a, b ) {

        var dx = a.x - b.x,
            dy = a.y - b.y;

        return Math.sqrt( dx*dx + dy*dy );

    }

    /**
     * Causes the address bar to hide on mobile devices,
     * more vertical space ftw.
     */
    function removeAddressBar() {

        if( window.orientation === 0 ) {
            document.documentElement.style.overflow = 'scroll';
            document.body.style.height = '120%';
        }
        else {
            document.documentElement.style.overflow = '';
            document.body.style.height = '100%';
        }

        setTimeout( function() {
            window.scrollTo( 0, 1 );
        }, 10 );

    }

    /**
     * Dispatches an event of the specified type from the
     * reveal DOM element.
     */
    function dispatchEvent( type, properties ) {

        var event = document.createEvent( "HTMLEvents", 1, 2 );
        event.initEvent( type, true, true );
        extend( event, properties );
        dom.wrapper.dispatchEvent( event );

    }

    /**
     * Wrap all links in 3D goodness.
     */
    function linkify() {

        if( supports3DTransforms && !( 'msPerspective' in document.body.style ) ) {
            var nodes = document.querySelectorAll( SLIDES_SELECTOR + ' a:not(.image)' );

            for( var i = 0, len = nodes.length; i < len; i++ ) {
                var node = nodes[i];

                if( node.textContent && !node.querySelector( '*' ) && ( !node.className || !node.classList.contains( node, 'roll' ) ) ) {
                    var span = document.createElement('span');
                    span.setAttribute('data-title', node.text);
                    span.innerHTML = node.innerHTML;

                    node.classList.add( 'roll' );
                    node.innerHTML = '';
                    node.appendChild(span);
                }
            }
        }

    }

    /**
     * Applies JavaScript-controlled layout rules to the
     * presentation.
     */
    function layout() {

        if( dom.wrapper ) {

            // Available space to scale within
            var availableWidth = dom.wrapper.offsetWidth,
                availableHeight = dom.wrapper.offsetHeight;

            // Reduce availabe space by margin
            availableWidth -= ( availableHeight * config.margin );
            availableHeight -= ( availableHeight * config.margin );

            // Dimensions of the content
            var slideWidth = config.width,
                slideHeight = config.height;

            // Slide width may be a percentage of available width
            if( typeof slideWidth === 'string' && /%$/.test( slideWidth ) ) {
                slideWidth = parseInt( slideWidth, 10 ) / 100 * availableWidth;
            }

            // Slide height may be a percentage of available height
            if( typeof slideHeight === 'string' && /%$/.test( slideHeight ) ) {
                slideHeight = parseInt( slideHeight, 10 ) / 100 * availableHeight;
            }

            dom.slides.style.width = slideWidth + 'px';
            dom.slides.style.height = slideHeight + 'px';

            // Determine scale of content to fit within available space
            scale = Math.min( availableWidth / slideWidth, availableHeight / slideHeight );

            // Respect max/min scale settings
            scale = Math.max( scale, config.minScale );
            scale = Math.min( scale, config.maxScale );

            // Prefer applying scale via zoom since Chrome blurs scaled content
            // with nested transforms
            if( typeof dom.slides.style.zoom !== 'undefined' && !navigator.userAgent.match( /(iphone|ipod|ipad|android)/gi ) ) {
                dom.slides.style.zoom = scale;
            }
            // Apply scale transform as a fallback
            else {
                var transform = 'translate(-50%, -50%) scale('+ scale +') translate(50%, 50%)';

                dom.slides.style.WebkitTransform = transform;
                dom.slides.style.MozTransform = transform;
                dom.slides.style.msTransform = transform;
                dom.slides.style.OTransform = transform;
                dom.slides.style.transform = transform;
            }

            if( config.center ) {

                // Select all slides, vertical and horizontal
                var slides = toArray( document.querySelectorAll( SLIDES_SELECTOR ) );

                // Determine the minimum top offset for slides
                var minTop = -slideHeight / 2;

                for( var i = 0, len = slides.length; i < len; i++ ) {
                    var slide = slides[ i ];

                    // Don't bother updating invisible slides
                    if( slide.style.display === 'none' ) {
                        continue;
                    }

                    // Vertical stacks are not centered since their section
                    // children will be
                    if( slide.classList.contains( 'stack' ) ) {
                        slide.style.top = 0;
                    }
                    else {
                        slide.style.top = Math.max( - ( slide.offsetHeight / 2 ) - 20, minTop ) + 'px';
                    }
                }

            }

        }

    }

    /**
     * Stores the vertical index of a stack so that the same
     * vertical slide can be selected when navigating to and
     * from the stack.
     *
     * @param {HTMLElement} stack The vertical stack element
     * @param {int} v Index to memorize
     */
    function setPreviousVerticalIndex( stack, v ) {

        if( stack ) {
            stack.setAttribute( 'data-previous-indexv', v || 0 );
        }

    }

    /**
     * Retrieves the vertical index which was stored using
     * #setPreviousVerticalIndex() or 0 if no previous index
     * exists.
     *
     * @param {HTMLElement} stack The vertical stack element
     */
    function getPreviousVerticalIndex( stack ) {

        if( stack && stack.classList.contains( 'stack' ) ) {
            return parseInt( stack.getAttribute( 'data-previous-indexv' ) || 0, 10 );
        }

        return 0;

    }

    /**
     * Displays the overview of slides (quick nav) by
     * scaling down and arranging all slide elements.
     *
     * Experimental feature, might be dropped if perf
     * can't be improved.
     */
    function activateOverview() {

        // Only proceed if enabled in config
        if( config.overview ) {

            // Don't auto-slide while in overview mode
            cancelAutoSlide();

            var wasActive = dom.wrapper.classList.contains( 'overview' );

            dom.wrapper.classList.add( 'overview' );
            dom.wrapper.classList.remove( 'exit-overview' );

            clearTimeout( activateOverviewTimeout );
            clearTimeout( deactivateOverviewTimeout );

            // Not the pretties solution, but need to let the overview
            // class apply first so that slides are measured accurately
            // before we can position them
            activateOverviewTimeout = setTimeout( function(){

                var horizontalSlides = document.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR );

                for( var i = 0, len1 = horizontalSlides.length; i < len1; i++ ) {
                    var hslide = horizontalSlides[i],
                        htransform = 'translateZ(-2500px) translate(' + ( ( i - indexh ) * 105 ) + '%, 0%)';

                    hslide.setAttribute( 'data-index-h', i );
                    hslide.style.display = 'block';
                    hslide.style.WebkitTransform = htransform;
                    hslide.style.MozTransform = htransform;
                    hslide.style.msTransform = htransform;
                    hslide.style.OTransform = htransform;
                    hslide.style.transform = htransform;

                    if( hslide.classList.contains( 'stack' ) ) {

                        var verticalSlides = hslide.querySelectorAll( 'section' );

                        for( var j = 0, len2 = verticalSlides.length; j < len2; j++ ) {
                            var verticalIndex = i === indexh ? indexv : getPreviousVerticalIndex( hslide );

                            var vslide = verticalSlides[j],
                                vtransform = 'translate(0%, ' + ( ( j - verticalIndex ) * 105 ) + '%)';

                            vslide.setAttribute( 'data-index-h', i );
                            vslide.setAttribute( 'data-index-v', j );
                            vslide.style.display = 'block';
                            vslide.style.WebkitTransform = vtransform;
                            vslide.style.MozTransform = vtransform;
                            vslide.style.msTransform = vtransform;
                            vslide.style.OTransform = vtransform;
                            vslide.style.transform = vtransform;

                            // Navigate to this slide on click
                            vslide.addEventListener( 'click', onOverviewSlideClicked, true );
                        }

                    }
                    else {

                        // Navigate to this slide on click
                        hslide.addEventListener( 'click', onOverviewSlideClicked, true );

                    }
                }

                layout();

                if( !wasActive ) {
                    // Notify observers of the overview showing
                    dispatchEvent( 'overviewshown', {
                        'indexh': indexh,
                        'indexv': indexv,
                        'currentSlide': currentSlide
                    } );
                }

            }, 10 );

        }

    }

    /**
     * Exits the slide overview and enters the currently
     * active slide.
     */
    function deactivateOverview() {

        // Only proceed if enabled in config
        if( config.overview ) {

            clearTimeout( activateOverviewTimeout );
            clearTimeout( deactivateOverviewTimeout );

            dom.wrapper.classList.remove( 'overview' );

            // Temporarily add a class so that transitions can do different things
            // depending on whether they are exiting/entering overview, or just
            // moving from slide to slide
            dom.wrapper.classList.add( 'exit-overview' );

            deactivateOverviewTimeout = setTimeout( function () {
                dom.wrapper.classList.remove( 'exit-overview' );
            }, 10);

            // Select all slides
            var slides = toArray( document.querySelectorAll( SLIDES_SELECTOR ) );

            for( var i = 0, len = slides.length; i < len; i++ ) {
                var element = slides[i];

                element.style.display = '';

                // Resets all transforms to use the external styles
                element.style.WebkitTransform = '';
                element.style.MozTransform = '';
                element.style.msTransform = '';
                element.style.OTransform = '';
                element.style.transform = '';

                element.removeEventListener( 'click', onOverviewSlideClicked, true );
            }

            slide( indexh, indexv );

            cueAutoSlide();

            // Notify observers of the overview hiding
            dispatchEvent( 'overviewhidden', {
                'indexh': indexh,
                'indexv': indexv,
                'currentSlide': currentSlide
            } );

        }
    }

    /**
     * Toggles the slide overview mode on and off.
     *
     * @param {Boolean} override Optional flag which overrides the
     * toggle logic and forcibly sets the desired state. True means
     * overview is open, false means it's closed.
     */
    function toggleOverview( override ) {

        if( typeof override === 'boolean' ) {
            override ? activateOverview() : deactivateOverview();
        }
        else {
            isOverview() ? deactivateOverview() : activateOverview();
        }

    }

    /**
     * Checks if the overview is currently active.
     *
     * @return {Boolean} true if the overview is active,
     * false otherwise
     */
    function isOverview() {

        return dom.wrapper.classList.contains( 'overview' );

    }

    /**
     * Handling the fullscreen functionality via the fullscreen API
     *
     * @see http://fullscreen.spec.whatwg.org/
     * @see https://developer.mozilla.org/en-US/docs/DOM/Using_fullscreen_mode
     */
    function enterFullscreen() {

        var element = document.body;

        // Check which implementation is available
        var requestMethod = element.requestFullScreen ||
            element.webkitRequestFullScreen ||
            element.mozRequestFullScreen ||
            element.msRequestFullScreen;

        if( requestMethod ) {
            requestMethod.apply( element );
        }

    }

    /**
     * Enters the paused mode which fades everything on screen to
     * black.
     */
    function pause() {

        cancelAutoSlide();
        dom.wrapper.classList.add( 'paused' );

    }

    /**
     * Exits from the paused mode.
     */
    function resume() {

        cueAutoSlide();
        dom.wrapper.classList.remove( 'paused' );

    }

    /**
     * Toggles the paused mode on and off.
     */
    function togglePause() {

        if( isPaused() ) {
            resume();
        }
        else {
            pause();
        }

    }

    /**
     * Checks if we are currently in the paused mode.
     */
    function isPaused() {

        return dom.wrapper.classList.contains( 'paused' );

    }

    /**
     * Steps from the current point in the presentation to the
     * slide which matches the specified horizontal and vertical
     * indices.
     *
     * @param {int} h Horizontal index of the target slide
     * @param {int} v Vertical index of the target slide
     * @param {int} f Optional index of a fragment within the
     * target slide to activate
     */
    function slide( h, v, f ) {

        // Remember where we were at before
        previousSlide = currentSlide;

        // Query all horizontal slides in the deck
        var horizontalSlides = document.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR );

        // If no vertical index is specified and the upcoming slide is a
        // stack, resume at its previous vertical index
        if( v === undefined ) {
            v = getPreviousVerticalIndex( horizontalSlides[ h ] );
        }

        // If we were on a vertical stack, remember what vertical index
        // it was on so we can resume at the same position when returning
        if( previousSlide && previousSlide.parentNode && previousSlide.parentNode.classList.contains( 'stack' ) ) {
            setPreviousVerticalIndex( previousSlide.parentNode, indexv );
        }

        // Remember the state before this slide
        var stateBefore = state.concat();

        // Reset the state array
        state.length = 0;

        var indexhBefore = indexh,
            indexvBefore = indexv;

        // Activate and transition to the new slide
        indexh = updateSlides( HORIZONTAL_SLIDES_SELECTOR, h === undefined ? indexh : h );
        indexv = updateSlides( VERTICAL_SLIDES_SELECTOR, v === undefined ? indexv : v );

        layout();

        // Apply the new state
        stateLoop: for( var i = 0, len = state.length; i < len; i++ ) {
            // Check if this state existed on the previous slide. If it
            // did, we will avoid adding it repeatedly
            for( var j = 0; j < stateBefore.length; j++ ) {
                if( stateBefore[j] === state[i] ) {
                    stateBefore.splice( j, 1 );
                    continue stateLoop;
                }
            }

            document.documentElement.classList.add( state[i] );

            // Dispatch custom event matching the state's name
            dispatchEvent( state[i] );
        }

        // Clean up the remains of the previous state
        while( stateBefore.length ) {
            document.documentElement.classList.remove( stateBefore.pop() );
        }

        // If the overview is active, re-activate it to update positions
        if( isOverview() ) {
            activateOverview();
        }

        // Update the URL hash after a delay since updating it mid-transition
        // is likely to cause visual lag
        writeURL( 1500 );

        // Find the current horizontal slide and any possible vertical slides
        // within it
        var currentHorizontalSlide = horizontalSlides[ indexh ],
            currentVerticalSlides = currentHorizontalSlide.querySelectorAll( 'section' );

        // Store references to the previous and current slides
        currentSlide = currentVerticalSlides[ indexv ] || currentHorizontalSlide;


        // Show fragment, if specified
        if( typeof f !== 'undefined' ) {
            var fragments = currentSlide.querySelectorAll( '.fragment' );

            toArray( fragments ).forEach( function( fragment, indexf ) {
                if( indexf < f ) {
                    fragment.classList.add( 'visible' );
                }
                else {
                    fragment.classList.remove( 'visible' );
                }
            } );
        }

        // Dispatch an event if the slide changed
        if( indexh !== indexhBefore || indexv !== indexvBefore ) {
            dispatchEvent( 'slidechanged', {
                'indexh': indexh,
                'indexv': indexv,
                'previousSlide': previousSlide,
                'currentSlide': currentSlide
            } );
        }
        else {
            // Ensure that the previous slide is never the same as the current
            previousSlide = null;
        }

        // Solves an edge case where the previous slide maintains the
        // 'present' class when navigating between adjacent vertical
        // stacks
        if( previousSlide ) {
            previousSlide.classList.remove( 'present' );

            // Reset all slides upon navigate to home
            // Issue: #285
            if ( document.querySelector( HOME_SLIDE_SELECTOR ).classList.contains( 'present' ) ) {
                // Launch async task
                setTimeout( function () {
                    var slides = toArray( document.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR + '.stack') ), i;
                    for( i in slides ) {
                        if( slides[i] ) {
                            // Reset stack
                            setPreviousVerticalIndex( slides[i], 0 );
                        }
                    }
                }, 0 );
            }
        }

        updateControls();
        updateProgress();

    }

    /**
     * Updates one dimension of slides by showing the slide
     * with the specified index.
     *
     * @param {String} selector A CSS selector that will fetch
     * the group of slides we are working with
     * @param {Number} index The index of the slide that should be
     * shown
     *
     * @return {Number} The index of the slide that is now shown,
     * might differ from the passed in index if it was out of
     * bounds.
     */
    function updateSlides( selector, index ) {

        // Select all slides and convert the NodeList result to
        // an array
        var slides = toArray( document.querySelectorAll( selector ) ),
            slidesLength = slides.length;

        if( slidesLength ) {

            // Should the index loop?
            if( config.loop ) {
                index %= slidesLength;

                if( index < 0 ) {
                    index = slidesLength + index;
                }
            }

            // Enforce max and minimum index bounds
            index = Math.max( Math.min( index, slidesLength - 1 ), 0 );

            for( var i = 0; i < slidesLength; i++ ) {
                var element = slides[i];

                // Optimization; hide all slides that are three or more steps
                // away from the present slide
                if( isOverview() === false ) {
                    // The distance loops so that it measures 1 between the first
                    // and last slides
                    var distance = Math.abs( ( index - i ) % ( slidesLength - 3 ) ) || 0;

                    element.style.display = distance > 3 ? 'none' : 'block';
                }

                slides[i].classList.remove( 'past' );
                slides[i].classList.remove( 'present' );
                slides[i].classList.remove( 'future' );

                if( i < index ) {
                    // Any element previous to index is given the 'past' class
                    slides[i].classList.add( 'past' );
                }
                else if( i > index ) {
                    // Any element subsequent to index is given the 'future' class
                    slides[i].classList.add( 'future' );
                }

                // If this element contains vertical slides
                if( element.querySelector( 'section' ) ) {
                    slides[i].classList.add( 'stack' );
                }
            }

            // Mark the current slide as present
            slides[index].classList.add( 'present' );

            // If this slide has a state associated with it, add it
            // onto the current state of the deck
            var slideState = slides[index].getAttribute( 'data-state' );
            if( slideState ) {
                state = state.concat( slideState.split( ' ' ) );
            }

            // If this slide has a data-autoslide attribtue associated use this as
            // autoSlide value otherwise use the global configured time
            var slideAutoSlide = slides[index].getAttribute( 'data-autoslide' );
            if( slideAutoSlide ) {
                autoSlide = parseInt( slideAutoSlide, 10 );
            }
            else {
                autoSlide = config.autoSlide;
            }

        }
        else {
            // Since there are no slides we can't be anywhere beyond the
            // zeroth index
            index = 0;
        }

        return index;

    }

    /**
     * Updates the progress bar to reflect the current slide.
     */
    function updateProgress() {

        // Update progress if enabled
        if( config.progress && dom.progress ) {

            var horizontalSlides = toArray( document.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) );

            // The number of past and total slides
            var totalCount = document.querySelectorAll( SLIDES_SELECTOR + ':not(.stack)' ).length;
            var pastCount = 0;

            // Step through all slides and count the past ones
            mainLoop: for( var i = 0; i < horizontalSlides.length; i++ ) {

                var horizontalSlide = horizontalSlides[i];
                var verticalSlides = toArray( horizontalSlide.querySelectorAll( 'section' ) );

                for( var j = 0; j < verticalSlides.length; j++ ) {

                    // Stop as soon as we arrive at the present
                    if( verticalSlides[j].classList.contains( 'present' ) ) {
                        break mainLoop;
                    }

                    pastCount++;

                }

                // Stop as soon as we arrive at the present
                if( horizontalSlide.classList.contains( 'present' ) ) {
                    break;
                }

                // Don't count the wrapping section for vertical slides
                if( horizontalSlide.classList.contains( 'stack' ) === false ) {
                    pastCount++;
                }

            }

            dom.progressbar.style.width = ( pastCount / ( totalCount - 1 ) ) * window.innerWidth + 'px';

        }

    }

    /**
     * Updates the state of all control/navigation arrows.
     */
    function updateControls() {

        if ( config.controls && dom.controls ) {

            var routes = availableRoutes();

            // Remove the 'enabled' class from all directions
            dom.controlsLeft.concat( dom.controlsRight )
                .concat( dom.controlsUp )
                .concat( dom.controlsDown )
                .concat( dom.controlsPrev )
                .concat( dom.controlsNext ).forEach( function( node ) {
                    node.classList.remove( 'enabled' );
                } );

            // Add the 'enabled' class to the available routes
            if( routes.left ) dom.controlsLeft.forEach( function( el ) { el.classList.add( 'enabled' );	} );
            if( routes.right ) dom.controlsRight.forEach( function( el ) { el.classList.add( 'enabled' ); } );
            if( routes.up ) dom.controlsUp.forEach( function( el ) { el.classList.add( 'enabled' );	} );
            if( routes.down ) dom.controlsDown.forEach( function( el ) { el.classList.add( 'enabled' ); } );

            // Prev/next buttons
            if( routes.left || routes.up ) dom.controlsPrev.forEach( function( el ) { el.classList.add( 'enabled' ); } );
            if( routes.right || routes.down ) dom.controlsNext.forEach( function( el ) { el.classList.add( 'enabled' ); } );

        }

    }

    /**
     * Determine what available routes there are for navigation.
     *
     * @return {Object} containing four booleans: left/right/up/down
     */
    function availableRoutes() {

        var horizontalSlides = document.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ),
            verticalSlides = document.querySelectorAll( VERTICAL_SLIDES_SELECTOR );

        return {
            left: indexh > 0,
            right: indexh < horizontalSlides.length - 1,
            up: indexv > 0,
            down: indexv < verticalSlides.length - 1
        };

    }

    /**
     * Reads the current URL (hash) and navigates accordingly.
     */
    function readURL() {

        var hash = window.location.hash;

        // Attempt to parse the hash as either an index or name
        var bits = hash.slice( 2 ).split( '/' ),
            name = hash.replace( /#|\//gi, '' );

        // If the first bit is invalid and there is a name we can
        // assume that this is a named link
        if( isNaN( parseInt( bits[0], 10 ) ) && name.length ) {
            // Find the slide with the specified name
            var element = document.querySelector( '#' + name );

            if( element ) {
                // Find the position of the named slide and navigate to it
                var indices = Reveal.getIndices( element );
                slide( indices.h, indices.v );
            }
            // If the slide doesn't exist, navigate to the current slide
            else {
                slide( indexh, indexv );
            }
        }
        else {
            // Read the index components of the hash
            var h = parseInt( bits[0], 10 ) || 0,
                v = parseInt( bits[1], 10 ) || 0;

            slide( h, v );
        }

    }

    /**
     * Updates the page URL (hash) to reflect the current
     * state.
     *
     * @param {Number} delay The time in ms to wait before
     * writing the hash
     */
    function writeURL( delay ) {

        if( config.history ) {

            // Make sure there's never more than one timeout running
            clearTimeout( writeURLTimeout );

            // If a delay is specified, timeout this call
            if( typeof delay === 'number' ) {
                writeURLTimeout = setTimeout( writeURL, delay );
            }
            else {
                var url = '/';

                // If the current slide has an ID, use that as a named link
                if( currentSlide && typeof currentSlide.getAttribute( 'id' ) === 'string' ) {
                    url = '/' + currentSlide.getAttribute( 'id' );
                }
                // Otherwise use the /h/v index
                else {
                    if( indexh > 0 || indexv > 0 ) url += indexh;
                    if( indexv > 0 ) url += '/' + indexv;
                }

                window.location.hash = url;
            }
        }

    }

    /**
     * Retrieves the h/v location of the current, or specified,
     * slide.
     *
     * @param {HTMLElement} slide If specified, the returned
     * index will be for this slide rather than the currently
     * active one
     *
     * @return {Object} { h: <int>, v: <int> }
     */
    function getIndices( slide ) {

        // By default, return the current indices
        var h = indexh,
            v = indexv;

        // If a slide is specified, return the indices of that slide
        if( slide ) {
            var isVertical = !!slide.parentNode.nodeName.match( /section/gi );
            var slideh = isVertical ? slide.parentNode : slide;

            // Select all horizontal slides
            var horizontalSlides = toArray( document.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) );

            // Now that we know which the horizontal slide is, get its index
            h = Math.max( horizontalSlides.indexOf( slideh ), 0 );

            // If this is a vertical slide, grab the vertical index
            if( isVertical ) {
                v = Math.max( toArray( slide.parentNode.querySelectorAll( 'section' ) ).indexOf( slide ), 0 );
            }
        }

        return { h: h, v: v };

    }

    /**
     * Navigate to the next slide fragment.
     *
     * @return {Boolean} true if there was a next fragment,
     * false otherwise
     */
    function nextFragment() {

        // Vertical slides:
        if( document.querySelector( VERTICAL_SLIDES_SELECTOR + '.present' ) ) {
            var verticalFragments = document.querySelectorAll( VERTICAL_SLIDES_SELECTOR + '.present .fragment:not(.visible)' );
            if( verticalFragments.length ) {
                verticalFragments[0].classList.add( 'visible' );

                // Notify subscribers of the change
                dispatchEvent( 'fragmentshown', { fragment: verticalFragments[0] } );
                return true;
            }
        }
        // Horizontal slides:
        else {
            var horizontalFragments = document.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR + '.present .fragment:not(.visible)' );
            if( horizontalFragments.length ) {
                horizontalFragments[0].classList.add( 'visible' );

                // Notify subscribers of the change
                dispatchEvent( 'fragmentshown', { fragment: horizontalFragments[0] } );
                return true;
            }
        }

        return false;

    }

    /**
     * Navigate to the previous slide fragment.
     *
     * @return {Boolean} true if there was a previous fragment,
     * false otherwise
     */
    function previousFragment() {

        // Vertical slides:
        if( document.querySelector( VERTICAL_SLIDES_SELECTOR + '.present' ) ) {
            var verticalFragments = document.querySelectorAll( VERTICAL_SLIDES_SELECTOR + '.present .fragment.visible' );
            if( verticalFragments.length ) {
                verticalFragments[ verticalFragments.length - 1 ].classList.remove( 'visible' );

                // Notify subscribers of the change
                dispatchEvent( 'fragmenthidden', { fragment: verticalFragments[ verticalFragments.length - 1 ] } );
                return true;
            }
        }
        // Horizontal slides:
        else {
            var horizontalFragments = document.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR + '.present .fragment.visible' );
            if( horizontalFragments.length ) {
                horizontalFragments[ horizontalFragments.length - 1 ].classList.remove( 'visible' );

                // Notify subscribers of the change
                dispatchEvent( 'fragmenthidden', { fragment: horizontalFragments[ horizontalFragments.length - 1 ] } );
                return true;
            }
        }

        return false;

    }

    /**
     * Cues a new automated slide if enabled in the config.
     */
    function cueAutoSlide() {

        clearTimeout( autoSlideTimeout );

        // Cue the next auto-slide if enabled
        if( autoSlide && !isPaused() && !isOverview() ) {
            autoSlideTimeout = setTimeout( navigateNext, autoSlide );
        }

    }

    /**
     * Cancels any ongoing request to auto-slide.
     */
    function cancelAutoSlide() {

        clearTimeout( autoSlideTimeout );

    }

    function navigateLeft() {

        // Prioritize hiding fragments
        if( availableRoutes().left && isOverview() || previousFragment() === false ) {
            slide( indexh - 1 );
        }

    }

    function navigateRight() {

        // Prioritize revealing fragments
        if( availableRoutes().right && isOverview() || nextFragment() === false ) {
            slide( indexh + 1 );
        }

    }

    function navigateUp() {

        // Prioritize hiding fragments
        if( availableRoutes().up && isOverview() || previousFragment() === false ) {
            slide( indexh, indexv - 1 );
        }

    }

    function navigateDown() {

        // Prioritize revealing fragments
        if( availableRoutes().down && isOverview() || nextFragment() === false ) {
            slide( indexh, indexv + 1 );
        }

    }

    /**
     * Navigates backwards, prioritized in the following order:
     * 1) Previous fragment
     * 2) Previous vertical slide
     * 3) Previous horizontal slide
     */
    function navigatePrev() {

        // Prioritize revealing fragments
        if( previousFragment() === false ) {
            if( availableRoutes().up ) {
                navigateUp();
            }
            else {
                // Fetch the previous horizontal slide, if there is one
                var previousSlide = document.querySelector( HORIZONTAL_SLIDES_SELECTOR + '.past:nth-child(' + indexh + ')' );

                if( previousSlide ) {
                    indexv = ( previousSlide.querySelectorAll( 'section' ).length + 1 ) || undefined;
                    indexh --;
                    slide();
                }
            }
        }

    }

    /**
     * Same as #navigatePrev() but navigates forwards.
     */
    function navigateNext() {

        // Prioritize revealing fragments
        if( nextFragment() === false ) {
            availableRoutes().down ? navigateDown() : navigateRight();
        }

        // If auto-sliding is enabled we need to cue up
        // another timeout
        cueAutoSlide();

    }


    // --------------------------------------------------------------------//
    // ----------------------------- EVENTS -------------------------------//
    // --------------------------------------------------------------------//


    /**
     * Handler for the document level 'keydown' event.
     *
     * @param {Object} event
     */
    function onDocumentKeyDown( event ) {

        // Check if there's a focused element that could be using
        // the keyboard
        var activeElement = document.activeElement;
        var hasFocus = !!( document.activeElement && ( document.activeElement.type || document.activeElement.href || document.activeElement.contentEditable !== 'inherit' ) );

        // Disregard the event if there's a focused element or a
        // keyboard modifier key is present
        if( hasFocus || event.shiftKey || event.altKey || event.ctrlKey || event.metaKey ) return;

        var triggered = true;

        // while paused only allow "unpausing" keyboard events (b and .)
        if( isPaused() && [66,190,191].indexOf( event.keyCode ) === -1 ) {
            return false;
        }

        switch( event.keyCode ) {
            // p, page up
            case 80: case 33: navigatePrev(); break;
            // n, page down
            case 78: case 34: navigateNext(); break;
            // h, left
            case 72: case 37: navigateLeft(); break;
            // l, right
            case 76: case 39: navigateRight(); break;
            // k, up
            case 75: case 38: navigateUp(); break;
            // j, down
            case 74: case 40: navigateDown(); break;
            // home
            case 36: slide( 0 ); break;
            // end
            case 35: slide( Number.MAX_VALUE ); break;
            // space
            case 32: isOverview() ? deactivateOverview() : navigateNext(); break;
            // return
            case 13: isOverview() ? deactivateOverview() : triggered = false; break;
            // b, period, Logitech presenter tools "black screen" button
            case 66: case 190: case 191: togglePause(); break;
            // f
            case 70: enterFullscreen(); break;
            default:
                triggered = false;
        }

        // If the input resulted in a triggered action we should prevent
        // the browsers default behavior
        if( triggered ) {
            event.preventDefault();
        }
        else if ( event.keyCode === 27 && supports3DTransforms ) {
            toggleOverview();

            event.preventDefault();
        }

        // If auto-sliding is enabled we need to cue up
        // another timeout
        cueAutoSlide();

    }

    /**
     * Handler for the document level 'touchstart' event,
     * enables support for swipe and pinch gestures.
     */
    function onDocumentTouchStart( event ) {

        touch.startX = event.touches[0].clientX;
        touch.startY = event.touches[0].clientY;
        touch.startCount = event.touches.length;

        // If there's two touches we need to memorize the distance
        // between those two points to detect pinching
        if( event.touches.length === 2 && config.overview ) {
            touch.startSpan = distanceBetween( {
                x: event.touches[1].clientX,
                y: event.touches[1].clientY
            }, {
                x: touch.startX,
                y: touch.startY
            } );
        }

    }

    /**
     * Handler for the document level 'touchmove' event.
     */
    function onDocumentTouchMove( event ) {

        // Each touch should only trigger one action
        if( !touch.handled ) {
            var currentX = event.touches[0].clientX;
            var currentY = event.touches[0].clientY;

            // If the touch started off with two points and still has
            // two active touches; test for the pinch gesture
            if( event.touches.length === 2 && touch.startCount === 2 && config.overview ) {

                // The current distance in pixels between the two touch points
                var currentSpan = distanceBetween( {
                    x: event.touches[1].clientX,
                    y: event.touches[1].clientY
                }, {
                    x: touch.startX,
                    y: touch.startY
                } );

                // If the span is larger than the desire amount we've got
                // ourselves a pinch
                if( Math.abs( touch.startSpan - currentSpan ) > touch.threshold ) {
                    touch.handled = true;

                    if( currentSpan < touch.startSpan ) {
                        activateOverview();
                    }
                    else {
                        deactivateOverview();
                    }
                }

                event.preventDefault();

            }
            // There was only one touch point, look for a swipe
            else if( event.touches.length === 1 && touch.startCount !== 2 ) {

                var deltaX = currentX - touch.startX,
                    deltaY = currentY - touch.startY;

                if( deltaX > touch.threshold && Math.abs( deltaX ) > Math.abs( deltaY ) ) {
                    touch.handled = true;
                    navigateLeft();
                }
                else if( deltaX < -touch.threshold && Math.abs( deltaX ) > Math.abs( deltaY ) ) {
                    touch.handled = true;
                    navigateRight();
                }
                else if( deltaY > touch.threshold ) {
                    touch.handled = true;
                    navigateUp();
                }
                else if( deltaY < -touch.threshold ) {
                    touch.handled = true;
                    navigateDown();
                }

                event.preventDefault();

            }
        }
        // There's a bug with swiping on some Android devices unless
        // the default action is always prevented
        else if( navigator.userAgent.match( /android/gi ) ) {
            event.preventDefault();
        }

    }

    /**
     * Handler for the document level 'touchend' event.
     */
    function onDocumentTouchEnd( event ) {

        touch.handled = false;

    }

    /**
     * Handles mouse wheel scrolling, throttled to avoid skipping
     * multiple slides.
     */
    function onDocumentMouseScroll( event ) {

        clearTimeout( mouseWheelTimeout );

        mouseWheelTimeout = setTimeout( function() {
            var delta = event.detail || -event.wheelDelta;
            if( delta > 0 ) {
                navigateNext();
            }
            else {
                navigatePrev();
            }
        }, 100 );

    }

    /**
     * Clicking on the progress bar results in a navigation to the
     * closest approximate horizontal slide using this equation:
     *
     * ( clickX / presentationWidth ) * numberOfSlides
     */
    function onProgressClicked( event ) {

        event.preventDefault();

        var slidesTotal = toArray( document.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) ).length;
        var slideIndex = Math.floor( ( event.clientX / dom.wrapper.offsetWidth ) * slidesTotal );

        slide( slideIndex );

    }

    /**
     * Event handler for navigation control buttons.
     */
    function onNavigateLeftClicked( event ) { event.preventDefault(); navigateLeft(); }
    function onNavigateRightClicked( event ) { event.preventDefault(); navigateRight(); }
    function onNavigateUpClicked( event ) { event.preventDefault(); navigateUp(); }
    function onNavigateDownClicked( event ) { event.preventDefault(); navigateDown(); }
    function onNavigatePrevClicked( event ) { event.preventDefault(); navigatePrev(); }
    function onNavigateNextClicked( event ) { event.preventDefault(); navigateNext(); }

    /**
     * Handler for the window level 'hashchange' event.
     */
    function onWindowHashChange( event ) {

        readURL();

    }

    /**
     * Handler for the window level 'resize' event.
     */
    function onWindowResize( event ) {

        layout();

    }

    /**
     * Invoked when a slide is and we're in the overview.
     */
    function onOverviewSlideClicked( event ) {

        // TODO There's a bug here where the event listeners are not
        // removed after deactivating the overview.
        if( isOverview() ) {
            event.preventDefault();

            deactivateOverview();

            var element = event.target;

            while( element && !element.nodeName.match( /section/gi ) ) {
                element = element.parentNode;
            }

            if( element.nodeName.match( /section/gi ) ) {
                var h = parseInt( element.getAttribute( 'data-index-h' ), 10 ),
                    v = parseInt( element.getAttribute( 'data-index-v' ), 10 );

                slide( h, v );
            }
        }

    }


    // --------------------------------------------------------------------//
    // ------------------------------- API --------------------------------//
    // --------------------------------------------------------------------//


    return {
        initialize: initialize,

        // Navigation methods
        slide: slide,
        left: navigateLeft,
        right: navigateRight,
        up: navigateUp,
        down: navigateDown,
        prev: navigatePrev,
        next: navigateNext,
        prevFragment: previousFragment,
        nextFragment: nextFragment,

        // Deprecated aliases
        navigateTo: slide,
        navigateLeft: navigateLeft,
        navigateRight: navigateRight,
        navigateUp: navigateUp,
        navigateDown: navigateDown,
        navigatePrev: navigatePrev,
        navigateNext: navigateNext,

        // Forces an update in slide layout
        layout: layout,

        // Toggles the overview mode on/off
        toggleOverview: toggleOverview,

        // Toggles the "black screen" mode on/off
        togglePause: togglePause,

        // State checks
        isOverview: isOverview,
        isPaused: isPaused,

        // Adds or removes all internal event listeners (such as keyboard)
        addEventListeners: addEventListeners,
        removeEventListeners: removeEventListeners,

        // Returns the indices of the current, or specified, slide
        getIndices: getIndices,

        // Returns the slide at the specified index, y is optional
        getSlide: function( x, y ) {
            var horizontalSlide = document.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR )[ x ];
            var verticalSlides = horizontalSlide && horizontalSlide.querySelectorAll( 'section' );

            if( typeof y !== 'undefined' ) {
                return verticalSlides ? verticalSlides[ y ] : undefined;
            }

            return horizontalSlide;
        },

        // Returns the previous slide element, may be null
        getPreviousSlide: function() {
            return previousSlide;
        },

        // Returns the current slide element
        getCurrentSlide: function() {
            return currentSlide;
        },

        // Returns the current scale of the presentation content
        getScale: function() {
            return scale;
        },

        // Helper method, retrieves query string as a key/value hash
        getQueryHash: function() {
            var query = {};

            location.search.replace( /[A-Z0-9]+?=(\w*)/gi, function(a) {
                query[ a.split( '=' ).shift() ] = a.split( '=' ).pop();
            } );

            return query;
        },

        // Returns true if we're currently on the first slide
        isFirstSlide: function() {
            return document.querySelector( SLIDES_SELECTOR + '.past' ) == null ? true : false;
        },

        // Returns true if we're currently on the last slide
        isLastSlide: function() {
            if( currentSlide && currentSlide.classList.contains( '.stack' ) ) {
                return currentSlide.querySelector( SLIDES_SELECTOR + '.future' ) == null ? true : false;
            }
            else {
                return document.querySelector( SLIDES_SELECTOR + '.future' ) == null ? true : false;
            }
        },

        // Forward event binding to the reveal DOM element
        addEventListener: function( type, listener, useCapture ) {
            if( 'addEventListener' in window ) {
                ( dom.wrapper || document.querySelector( '.reveal' ) ).addEventListener( type, listener, useCapture );
            }
        },
        removeEventListener: function( type, listener, useCapture ) {
            if( 'addEventListener' in window ) {
                ( dom.wrapper || document.querySelector( '.reveal' ) ).removeEventListener( type, listener, useCapture );
            }
        }
    };

})()

    Reveal.initialize({
        autoSlide: 3000,
        loop: true,
        controls: false
    });

    Reveal.addEventListener( 'updateSlides', function() {
            $.get('?m=presentation&aAct=fetch', {}, function(response){
                $("#presentationHolder").html(response).fadeIn(500);
            });
    }, false );

});